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Let Connection end at midpoint of ContainerShape [message #1798834]

Mon, 26 November 2018 13:47

Felix Buehler

Messages: 15
Registered: July 2017

Junior Member

Hey there!

I am trying to let a curved connection end at the midpoint of a ContainerShape. Currently we are using ChopBoxAnchors for the Start- and EndPoints of the connection.
The current situation looks like this:
index.php/fa/34404/0/

I'm trying to achieve that the CurvedConnection ends in the middle of the point.
One solution I found was replacing the ChopBoxAnchors by BoxRelativeAnchors and set

boxRelativeAnchor.setRelativeHeight(0.5);
boxRelativeAnchor.setRelativeWidth(0.5);

This way the graphic is corrected but the selection on the containerShape (which here is represented by an ellipse) is not working anymore because the selection always (or mostly) selects the curve.
As i read in different posts the GEF-ConnectionLayer seems to be always on top of the shape-layer.

Does anyone have a suggestion on how to solve the selection behavior (so that BoxRelativeAnchors could work) or a different approach?

Thanks in advance and best regards!
Felix

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Re: Let Connection end at midpoint of ContainerShape [message #1798921 is a reply to message #1798834]

Tue, 27 November 2018 13:16

Michael Wenz

Messages: 1913
Registered: July 2009
Location: Walldorf, Germany

Senior Member

Hi Felix,

not sure if that will really help in this case, but to change the selection for a user click you can implement the method getSelection in your tool behavior provider. Have you alread tried that?

Michael

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Re: Let Connection end at midpoint of ContainerShape [message #1798972 is a reply to message #1798921]

Wed, 28 November 2018 08:10

Felix Buehler

Messages: 15
Registered: July 2017

Junior Member

Hi Michael!

I tried your suggestion. Unfortunately the getSelection is only called from the ShapeEditPart, not from the ConnectionEditPart. So I don't see a way to prevent the selection of connections here.

Is there a way to prevent the selection of connections completely?

Regards,
Felix

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Re: Let Connection end at midpoint of ContainerShape [message #1799035 is a reply to message #1798972]

Thu, 29 November 2018 08:39

Michael Wenz

Messages: 1913
Registered: July 2009
Location: Walldorf, Germany

Senior Member

Hi Felix,

sorry, you are right of course. Changing the selection only works for shapes. Maybe we should add that for connections as well...?

Selection of connections can be disabled by returning false in method isConnectionSelectionEnabled() in your tool behavior provider.

Michael

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Re: Let Connection end at midpoint of ContainerShape [message #1799058 is a reply to message #1799035]

Thu, 29 November 2018 12:59

Felix Buehler

Messages: 15
Registered: July 2017

Junior Member

Hey Michael,

disabling connections by overwriting isConnectionSelectionEnabled() works. However, if I click at the location where a connection crosses a shape, nothing gets selected. My expectation would be, that the shape gets the selection.

It looks like a similar problem. In the select()-method of GrahpitiScrollingGraphicalViewer nothing is done in the else-bracket because the editpart is a FreeFormConnectionEditpart and the model a FreeFormConnection.

Is this a gap in graphiti or am I missing something?

Thanks a lot!
Felix

[Updated on: Thu, 29 November 2018 12:59]

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